Fixes the problem where the link to the CC dashboard doesn't get highlighted when it's the current page.  Added a separate cc_dashboard entry in current-user.coffee's ROUTES map that links to the correct react route.
Fixes the problem where the link to the CC dashboard doesn't get highlighted when it's the current page.  Added a separate cc_dashboard entry in current-user.coffee's ROUTES map that links to the correct react route.

openstax/tutor-js,openstax/tutor-js,openstax/tutor-js,openstax/tutor-js,openstax/tutor-js